⛽ Pre-warm the tab list file.

chrome/android/javatests/src/org/chromium/chrome/browser/tabmodel/DocumentModeAssassinTest.java

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.tabmodel;
 
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.test.MoreAsserts;
 import android.test.suitebuilder.annotation.MediumTest;
@@ skipping 421 matching lines @@
         assertNotNull(tabbedModeFilesAfter);
         assertEquals(numFilesBefore + 1, tabbedModeFilesAfter.length);
         confirmTabModelMetadataFileIsCorrect(failureCase);
     }
 
     private void confirmTabModelMetadataFileIsCorrect(@Nullable TabStateInfo failureCase)
             throws Exception {
         // Load up the metadata file via a TabPersistentStore to make sure that it contains all of
         // the migrated tab information.
         loadNativeLibraryAndInitBrowserProcess();
-        TabPersistentStore.setBaseStateDirectory(mTabbedModeDirectory.getBaseDirectory());
+        TabPersistentStore.setBaseStateDirectoryForTests(mTabbedModeDirectory.getBaseDirectory());
 
         TestTabModelSelector selector = new TestTabModelSelector(mContext);
         TabPersistentStore store = selector.mTabPersistentStore;
         MockTabPersistentStoreObserver mockObserver = selector.mTabPersistentStoreObserver;
 
         // Load up the TabModel metadata.
         int numExpectedTabs = TEST_INFO.numRegularTabs + TEST_INFO.numIncognitoTabs;
         store.loadState();
         mockObserver.initializedCallback.waitForCallback(0, 1);
         assertEquals(numExpectedTabs, mockObserver.mTabCountAtStartup);
@@ skipping 203 matching lines @@
             mDocumentModeDirectory.writeTabStateFile(TAB_STATE_INFO[i]);
         }
 
         // Write out some random files that should have been ignored by migration.
         writeUselessFileToDirectory(mDocumentModeDirectory.getDataDirectory(), "ignored.file");
         writeUselessFileToDirectory(mDocumentModeDirectory.getDataDirectory(),
                 TabState.SAVED_TAB_STATE_FILE_PREFIX + "_unparseable");
 
     }
 }